[Gllug] Constrained virtual machines

[Daniel P. Berrange]

On Fri, Dec 01, 2006 at 12:18:41PM +0000, Richard Jones wrote:
> On Fri, Dec 01, 2006 at 12:47:26PM +0000, Daniel P. Berrange wrote:
> > With Xen and a paravirtualized kernel you can get disk I/O to be within
> > 95% of baremetal performance, or better.
> 
> It'd be interesting to see how you measure this - whether this is a
> consequence of measuring simple 'dd-like' throughput, or whether you
> are looking at application mixes (database + webserver would be
> particularly interesting) and measuring overall speed of service.

Our performance guys use a suite of about 10 difference benchmarks to
measure / stress it in various ways. Some are micro benchmarks testing
particular subsystems - raw compute, disk, network. Others are real 
world workloads like Oracle TPC-C/OLTP, Sybase TPC-C,r Spec-<XXX> or AIM.
Those figures are for a host with a single guest - essentially reflecting
the base-level overhead of Xen. They then scale up number of guests,
run on boxes with more CPUs to see how well the HyperVisor does at
scheduling concurrent workloads.

Regards,
Dan.
-- 
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